refactor(oas): extract uri template logic

relates-to #120

packages/oas/src/converter/BaseUrlParser.ts

@@ -1,6 +1,7 @@
 import { isOASV2, isOASV3 } from '../utils';
 import { ConvertError } from '../errors';
 import { Sampler } from './Sampler';
+import { UriTemplator } from './UriTemplator';
 import {
   normalizeUrl,
   removeLeadingSlash,
@@ -10,9 +11,10 @@ import {
   OpenAPIV3
 } from '@har-sdk/core';
 import pointer from 'json-pointer';
-import template from 'url-template';
 
 export class BaseUrlParser {
+  private readonly uriTemplator = new UriTemplator();
+
   constructor(private readonly sampler: Sampler) {}
 
   public parse(spec: OpenAPI.Document): string {
@@ -101,11 +103,11 @@ export class BaseUrlParser {
         }),
         {}
       );
-      const templateUrl = template.parse(server.url);
-      const rawUrl = templateUrl.expand(params);
-      const jsonPointer = pointer.compile(['servers', idx.toString()]);
 
-      return this.normalizeUrl(rawUrl, { jsonPointer });
+      return this.normalizeUrl(
+        this.uriTemplator.substitute(server.url, params),
+        { jsonPointer: pointer.compile(['servers', idx.toString()]) }
+      );
     });
   }
 }

packages/oas/src/converter/DefaultConverter.ts

@@ -1,6 +1,5 @@
 import { BaseUrlParser } from './BaseUrlParser';
 import { Converter } from './Converter';
-import { ParamsSerializer } from './ParamsSerializer';
 import { Sampler } from './Sampler';
 import {
   SubPart,
@@ -26,7 +25,6 @@ type PathItemObject = OpenAPIV2.PathItemObject | OpenAPIV3.PathItemObject;
 
 export class DefaultConverter implements Converter {
   private readonly sampler = new Sampler();
-  private readonly paramsSerializer = new ParamsSerializer();
   private readonly baseUrlConverter = new BaseUrlParser(this.sampler);
 
   private spec: OpenAPI.Document;
@@ -117,15 +115,11 @@ export class DefaultConverter implements Converter {
       case SubPart.HEADERS:
         return new HeadersConverter(spec, this.sampler);
       case SubPart.PATH:
-        return new PathConverter(spec, this.sampler, this.paramsSerializer);
+        return new PathConverter(spec, this.sampler);
       case SubPart.POST_DATA:
         return new PostDataConverter(spec, this.sampler);
       case SubPart.QUERY_STRING:
-        return new QueryStringConverter(
-          spec,
-          this.sampler,
-          this.paramsSerializer
-        );
+        return new QueryStringConverter(spec, this.sampler);
     }
   }
 

packages/oas/src/converter/Oas2ValueSerializer.ts

@@ -0,0 +1,42 @@
+import { isObject, Flattener } from '../utils';
+import { OpenAPIV2 } from '@har-sdk/core';
+
+export class Oas2ValueSerializer {
+  private readonly flattener = new Flattener();
+
+  public serialize(
+    param: OpenAPIV2.Parameter,
+    // eslint-disable-next-line @typescript-eslint/explicit-module-boundary-types
+    value: any
+  ): any {
+    const style = param.collectionFormat;
+    const explode = param.collectionFormat === 'multi';
+
+    if (explode) {
+      return value;
+    }
+
+    const delimiter = this.getDelimiter(style);
+    if (Array.isArray(value)) {
+      return value.join(delimiter);
+    } else if (isObject(value)) {
+      return this.flattener.toFlattenArray(value).join(delimiter);
+    }
+
+    return value;
+  }
+
+  private getDelimiter(style: string): string {
+    switch (style) {
+      case 'ssv':
+        return ' ';
+      case 'tsv':
+        return '\t';
+      case 'pipes':
+        return '|';
+      case 'csv':
+      default:
+        return ',';
+    }
+  }
+}

packages/oas/src/converter/UriTemplator.ts

@@ -0,0 +1,7 @@
+import template from 'url-template';
+
+export class UriTemplator {
+  public substitute(templateStr: string, values: Record<string, any>): string {
+    return template.parse(templateStr).expand(values);
+  }
+}

packages/oas/src/converter/subconverters/PathConverter.ts

@@ -1,24 +1,26 @@
 import { ParameterObject } from '../../types';
 import { isOASV2, getParameters, filterLocationParams } from '../../utils';
 import { Sampler } from '../Sampler';
-import { ParamsSerializer } from '../ParamsSerializer';
+import { Oas2ValueSerializer } from '../Oas2ValueSerializer';
+import { UriTemplator } from '../UriTemplator';
 import { SubConverter } from './SubConverter';
 import { OpenAPI, OpenAPIV2, OpenAPIV3 } from '@har-sdk/core';
-import template from 'url-template';
 
 export class PathConverter implements SubConverter<string> {
+  private uriTemplator = new UriTemplator();
+  private oas2ValueSerializer = new Oas2ValueSerializer();
+
   constructor(
     private readonly spec: OpenAPI.Document,
-    private readonly sampler: Sampler,
-    private readonly paramsSerializer: ParamsSerializer
+    private readonly sampler: Sampler
   ) {}
 
   public convert(path: string, method: string): string {
     const params: ParameterObject[] = getParameters(this.spec, path, method);
     const pathParams = filterLocationParams(params, 'path');
 
     const tokens = ['paths', path, method];
-    const sampledParams = pathParams.map((param) =>
+    const sampledParamValues = pathParams.map((param) =>
       this.sampler.sampleParam(param, {
         tokens,
         spec: this.spec,
@@ -27,63 +29,59 @@ export class PathConverter implements SubConverter<string> {
     );
 
     return isOASV2(this.spec)
-      ? this.serializeOas2Path(
+      ? this.parseOas2Path(
           path,
           pathParams as OpenAPIV2.Parameter[],
-          sampledParams
+          sampledParamValues
         )
-      : this.serializeOas3Path(
+      : this.parseOas3Path(
           path,
           pathParams as OpenAPIV3.ParameterObject[],
-          sampledParams
+          sampledParamValues
         );
   }
 
-  private serializeOas2Path(
+  private parseOas2Path(
     path: string,
     pathParams: OpenAPIV2.Parameter[],
-    sampledParams: any[]
+    values: any[]
   ): string {
     return encodeURI(
       pathParams.reduce(
         (res, param, idx) =>
           res.replace(
             `{${param.name}}`,
-            this.paramsSerializer.serializeValue(
-              param,
-              sampledParams[idx],
-              false
-            )
+            this.oas2ValueSerializer.serialize(param, values[idx])
           ),
         path
       )
     );
   }
 
-  // TODO extract URI template logic
-  private serializeOas3Path(
-    path: string,
-    pathParams: OpenAPIV3.ParameterObject[],
-    sampledParams: any[]
+  private parseOas3Path(
+    input: string,
+    params: OpenAPIV3.ParameterObject[],
+    values: any[]
   ): string {
-    const uriTemplatePath = pathParams.reduce(
+    const pathTemplateStr = params.reduce(
       (res, param) =>
-        res.replace(`{${param.name}}`, this.getParamUriTemplate(param)),
-      path
+        res.replace(`{${param.name}}`, this.getOas3PathParamUriTemplate(param)),
+      input
     );
 
-    return template.parse(uriTemplatePath).expand(
-      pathParams.reduce(
-        (res: Record<string, any>, param, idx) => ({
+    return this.uriTemplator.substitute(
+      pathTemplateStr,
+      params.reduce(
+        (res, param, idx) => ({
           ...res,
-          [param.name]: sampledParams[idx]
+          [param.name]: values[idx]
         }),
         {}
       )
     );
   }
 
-  private getParamUriTemplate({
+  private getOas3PathParamUriTemplate({
     name,
     style,
     explode